Add typescript support realtime

[Aschen]

What does this PR do?

Convert realtime controller to TS

⚠️ The whole SDK does not works with TS now since we need to convert every exported class

[Njuelle]

;)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (7-dev@005269a). Click here to learn what that means.
The diff coverage is 90.32%.

@@           Coverage Diff            @@
##             7-dev     #528   +/-   ##
========================================
  Coverage         ?   90.96%           
========================================
  Files            ?       32           
  Lines            ?     1406           
  Branches         ?      136           
========================================
  Hits             ?     1279           
  Misses           ?      100           
  Partials         ?       27           

Impacted Files	Coverage Δ
src/controllers/Auth.ts	75.94% <ø> (ø)
src/controllers/Document.ts	71.91% <ø> (ø)
src/core/Room.js	100.00% <ø> (ø)
src/controllers/Realtime.ts	90.32% <90.32%> (ø)

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[Aschen]

See this PR instead because Travis have a bug on this one